'git branch' shows which branch you are currently on with an '*', but
'git for-each-ref' misses this feature.  So, extend the format with
%(HEAD) to do exactly the same thing.

Now you can use the following format in for-each-ref:

  %C(red)%(HEAD)%C(reset) %C(green)%(refname:short)%C(reset)

to display a red asterisk next to the current ref.

Signed-off-by: Ramkumar Ramachandra <artag...@gmail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/git-for-each-ref.txt |  4 ++++
 builtin/for-each-ref.c             | 13 +++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-for-each-ref.txt 
b/Documentation/git-for-each-ref.txt
index 8cbc08c..8d982e3 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -121,6 +121,10 @@ upstream::
        from the displayed ref. Respects `:short` in the same way as
        `refname` above.
 
+HEAD::
+       Useful to indicate the currently checked out branch.  Is '*'
+       if HEAD points to the current ref, and ' ' otherwise.
+
 In addition to the above, for commit and tag objects, the header
 field names (`tree`, `parent`, `object`, `type`, and `tag`) can
 be used to specify the value in the header field.
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index da479d1..3d357a9 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -76,6 +76,7 @@ static struct {
        { "upstream" },
        { "symref" },
        { "flag" },
+       { "HEAD" },
 };
 
 /*
@@ -679,8 +680,16 @@ static void populate_value(struct refinfo *ref)
                                v->s = xstrdup(buf + 1);
                        }
                        continue;
-               }
-               else
+               } else if (!strcmp(name, "HEAD")) {
+                       const char *head;
+                       unsigned char sha1[20];
+                       head = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
+                       if (!strcmp(ref->refname, head))
+                               v->s = "*";
+                       else
+                               v->s = " ";
+                       continue;
+               } else
                        continue;
 
                formatp = strchr(name, ':');
-- 
1.8.3.247.g485169c

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